As a kid, we had:
Trilogy on CBS Fox VHS Set
A New Hope on Betamax
Trilogy on CED Discs
CED Discs transferred to SLP VHS tape (why did both of our parents do this, 005?)
Some 8mm 10 minute long reel in B&W

Personally
Trilogy on Faces Widescreen Box (the huge side-by-side one)
Trilogy on Silver SE VHS box
Trilogy on 2004 DVDs

And I also own
PT on dual disc DVDs
Both Clone Wars cartoons DVDs that came out before RotS
Ewok Movies Double Feature
Ewok Cartoons
Droids Cartoons
R2-D2 Beneath the Dome
Hardware Wars (I had the SE on tape, and I was ticked this wasn't also on the DVD. It's like 10 minutes long, they couldn't have but both of them on there?)
And that music one I got with RotS.

I think that's it. I didn't buy the 2006 GOUT, but I did get RotJ GOUT from Netflix once.

So not as many as I'm sure many of you have. But I've done my part, no doubt.